Vector3 CalculateProjectileLead(Vector3 startPos, Vector3 targetPos, Vector3 targetVel, float initialVelocity, float gravityScale, float drag) {
    float distance = (targetPos - startPos).Length();
    float travelTime = distance / initialVelocity;
    
    // Account for air drag deceleration
    travelTime += (0.5f * drag * distance * travelTime);
    
    // Predicted target lead position
    Vector3 predicted = targetPos + (targetVel * travelTime);
    
    // Gravitational drop (Rust standard gravity = 9.81 m/s^2)
    float drop = 0.5f * (9.81f * gravityScale) * (travelTime * travelTime);
    predicted.y += drop;
    return predicted;
}